Critical severity · published Dec 13, 2019
CVE-2019-18802
An issue was discovered in Envoy 1.12.0
9.8
CVSS
2.5%
EPSS
No
On KEV
Description
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.5% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
Envoy · Envoyproxy
through 1.12.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18802
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-18802
lists.opensuse.org
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html
Product
https://blog.envoyproxy.io
Patch
https://github.com/envoyproxy/envoy/commits/master
Exploit
https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4
groups.google.com
https://groups.google.com/forum/#%21forum/envoy-users
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